Anti Spam Word What Is The Very Best "free" Anti-Spam Software On The Internet One Which I Can Dictate What Words To Exclude?

What is the very best "free" Anti-Spam software on the Internet one which I can dictate what words to exclude? - anti spam word

This software must be completely free, "as it is for charity in the United Kingdom.

Thank you in advance for very good answers to all of you there - after all, what he does get points for easier reading!